IBM T400F manual Function Code H Test Head, Function Code L Reserved for Future Use

Table 9. Diagnostic and maintenance functions (continued)

Function Code H - Test Head

Causes the tape drive to perform the Head Resistance Measurements test and a Write/Read test (on the center of the tape). The drive runs these tests to ensure that the tape drive’s head and tape-carriage mechanics are working correctly. The tape drive takes approximately 10 minutes to run the test.

1.Make sure that no cartridge is in the drive.

2.Within a 1.5-second interval, press the unload button three times. The status light becomes solid amber, which means that the drive is in maintenance mode.

3.Press the unload button once per 1.5 seconds until H appears in the single-character display. If you cycle past H, continue to press the unload button until it redisplays.

4.To select the function, press and hold the unload button for 3 seconds. After you select the function, C flashes. When C flashes, the drive is waiting for a cartridge. Within 60 seconds, insert a scratch data cartridge (or the tape drive exits maintenance mode). After you insert the cartridge, H flashes and the test begins:

vIf no error is detected, the test begins again and runs for a maximum of 10 times. Each loop takes approximately 10 minutes to run. After the tenth loop, the test stops and the drive automatically exits maintenance mode. To halt the test, press the unload button. The drive acknowledges the request by slowing the length of time that the currently displayed character flashes on the single-character display (from twice per second to once per second). The test continues to the end of its loop and then stops. The tape drive then rewinds and unloads the cartridge, displays 0, and exits maintenance mode.

vIf an error is detected, the tape drive displays 5, unloads the tape cartridge, and exits maintenance mode. To resolve the error, locate 5 in Table 15 on page 67.

Function Code L - Reserved for Future Use

Reserved for future use.

Function Code P or U - Enable or Disable Post Error Reporting

Used by support personnel during error detection, this function is an alternate method of setting or preventing the post error (PER) bit in the SCSI Read-Write Error Recovery Page. For more information, refer to the MODE SENSE command in the IBM TotalStorage LTO Ultrium Tape Drive SCSI Reference.

1.Make sure that no cartridge is in the drive.

2.Within a 1.5-second interval, press the unload button three times. The status light becomes solid amber, which means that the drive is in maintenance mode.

3.Perform one of the following:

vTo enable post error reporting, press the unload button once per 1.5 seconds until U appears in the single-character display. If you cycle past U, continue to press the unload button until it redisplays.

vTo disable post error reporting, press the unload button once per 1.5 seconds until P appears in the single-character display. If you cycle past P, continue to press the unload button until it redisplays.

4.To select the function, press and hold the unload button for 3 seconds. After you select the function, the drive displays one of the following:

vP to indicate that post error reporting is enabled.

vU to indicate that post error reporting is disabled.

44IBM TotalStorage LTO Ultrium 2 Tape Drive